# An example with hex strings, the string "33" specifies three units on followed# by three off and "3313" specifies three units on followed by three off followed# by one on and finally three off.f + geom_line(linetype="3313")

# Shape examples# Shape takes four types of values: an integer in [0, 25],# a single character-- which uses that character as the plotting symbol,# a . to draw the smallest rectangle that is visible (i.e., about one pixel)# an NA to draw nothingp + geom_point()